I do know a little bit about Mary Ann Powell and John Jones. They had three children. John Henry Jones , James W Jones and Mary Ann Jones.
John Henry born 1860 married Joan Davies born 1861. They went to US in 1893 with their children Samuel b 1883, William H b 1885, and Albert b 1888. They had at least one more child in Pennsylvania a daughter with a hard to read name on the census looks something like Inez born 1897 Penn.
James W Jones born 1871 married Ellen A Morris b 1870. They went to USA in 1886. Their children all born in Penn. were Minnie b 1891, Adelaide b 1893, Arthur b 1896, Agnes who died aged 7 and Dorothy.
Mary Ann Jones b 1869 married Arthur Lewis born 1861. They went to USA in 1887. They had at least 4 children James A Lewis born 1892 and Mary p Lewis born 1897, however I do not know the names of the remaining children. They lived in the Freeland area I think. Will need to go back to the 1901 census to check.
Hope this fills in a few gaps for you. Thank you so much for going to all this trouble for me. I'm sorry I didn't tell you more at the start. Hope you can understand all this , I written it rather hurriedly .Dash.